@Gordon There are so many different types of piezos ( https://www.reichelt.de/signalakustik-c6560.html?GROUPID=6560&GROUPID=6560&&nbc=1;SID=94XoiXrqwQATQAAHctp0w31e14953fa14751d233b694115518b39 )
Another one has an impedance of 1500 Ohm: https://cdn-reichelt.de/documents/datenblatt/B400/EKULIT-190023.pdf Would that be even better?
Considering they all cost about 40 cents each, why don't you order one of each, "plug" them in to test and then choose the loudest?
@user110973 started
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@Gordon
There are so many different types of piezos ( https://www.reichelt.de/signalakustik-c6560.html?GROUPID=6560&GROUPID=6560&&nbc=1;SID=94XoiXrqwQATQAAHctp0w31e14953fa14751d233b694115518b39 )
Another one has an impedance of 1500 Ohm: https://cdn-reichelt.de/documents/datenblatt/B400/EKULIT-190023.pdf Would that be even better?